OCR Text |
Show 1902.] NEW MARINE SPIDER. 391 decrease in size towards tlie proximal end of the mandible; all the teeth evenly spaced. Legs 1, 4, 2, 3 in length. 1st leg with a superior basal spine on femur, the remaining segments unspined: 2nd leg with superior basal and anterior apical femoral spine, three inferior apical protarsal spines (sometimes one median inferior protarsal spine as well), and one inferior median tarsal spine : 3rd leg with one superior basal and three apical spines on femur, one superior, two or one anterior and two or one posterior, and two inferior apical spines on tibia; one superior, two anterior, two posterior, and five inferior, of which three are apical, on the protarsus, and six inferior spines on the tarsus: 4th leg with one superior basal and one posterior apical spine on femur, two or three posterior, three inferior spines, of which two are apical, on the tibia, and about twelve spines on the protarsus somewhat irregularly arranged as follows-two above, two behind, two in front, and three pairs beneath ; the tarsus armed with about six spines : the protarsi of the 2nd, 3rd, and 4tli legs furnished beneath with a pad of greyish hairs. Vulva (text-fig. 78, C) formed upon the same plan as in the other species of the genus, the median excavation very shallow, the lateral teeth distinct and projecting inwards and downwards, the posterior median angle forming a rounded, smooth, subvertical prominence showing a shallow basal constriction. Measurements in mm.:-Total length 10, carapace 5 ; 1st leg 15, 2nd leg 11, 3rd leg 13, 4th leg 9'5. Loc. Zanzibar. " Under stones at low tide" (Cyril Crossland). In a young specimen (about 2 mm. in length) the eyes have the same arrangement as in the adults, but are relatively much larger and consequently closer together; the mandibles are less prominent, and armed below with one outer and four inner teeth ; the trochanter of the palp is small, not elongate; the maxillary processes are parallel-sided, lightly convergent, and obtusely rounded at the apex; and the labium is wider than long and almost semicircularly rounded marginally. In the spacing of its eyes and the spine-armature of its legs ljns species is allied to L). maocillosa, voraoc, martensi, and marina, which constitute a group hitherto believed to be restricted in range to the coasts lying between Singapore and New Zealand. Of these four species, the only two known to me are 1). martensi f i*om Singapore and D. marina from ^NTew Zealand and -A-Ustialia. From both of these D. crosslandi differs in the form of the vulva and the closer spacing of the eyes. It resembles D. marina in the size and spacing of the two teeth on the posterior or outer side of the fang-groove of the mandible; but in D. marina the first tooth of the inner row is separated by a relatively wider space from the second than is the case in D. crosslandi. Of the other two species, namely, D. vorax from Upolu and D rnaxillosa from New Guinea, &c., I can only speak with |